Android中如何实现圆形图片效果

本篇内容主要讲解"Android中如何实现圆形图片效果"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"Android中如何实现圆形图片效果"吧!

创建RoundPicture.java文件

在src/main/java/XX包下新建RoundPicture.java

写入RoundPicture.java文件

复制下方代码，并引入类即可

public class RoundPicture extends androidx.appcompat.widget.AppCompatImageView {    private Paint paint;    public RoundPicture(Context context) {        this(context, null);    }    public RoundPicture(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public RoundPicture(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        paint = new Paint();    }//    绘制圆形图片    @Override    protected void onDraw(Canvas canvas) {        Drawable drawable = getDrawable();        if (null != drawable) {            Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();            Bitmap b = getCircleBitmap(bitmap, 14);            final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight());            final Rect rectDest = new Rect(0, 0, getWidth(), getHeight());            paint.reset();            canvas.drawBitmap(b, rectSrc, rectDest, paint);        } else {            super.onDraw(canvas);        }    }//     获取圆形图片方法    private Bitmap getCircleBitmap(Bitmap bitmap, int pixels) {        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(output);        final int color = 0xff424242;        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());        paint.setAntiAlias(true);        canvas.drawARGB(0, 0, 0, 0);        paint.setColor(color);        int x = bitmap.getWidth();        canvas.drawCircle(x / 2, x / 2, x / 2, paint);        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));        canvas.drawBitmap(bitmap, rect, rect, paint);        return output;    }}

调用RoundPicture创建圆形图片

只需在.xml文件中插入图片处，将控件名改为
< XX.RoundPicture 并引入图片即可

到此，相信大家对"Android中如何实现圆形图片效果"有了更深的了解，不妨来实际操作一番吧！这里是网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！